| US 7,522,012 B2 | ||
| Nonreciprocal circuit device and manufacturing method of the same | ||
| Takaya Wada, Kanazawa (Japan) | ||
| Assigned to Murata Manufacturing Co., Ltd., Kyoto (Japan) | ||
| Filed on May 28, 2008, as Appl. No. 12/127,938. | ||
| Application 12/127938 is a continuation of application No. PCT/JP2007/071988, filed on Nov. 13, 2007. | ||
| Claims priority of application No. 2007-009489 (JP), filed on Jan. 18, 2007. | ||
| Prior Publication US 2008/0218289 A1, Sep. 11, 2008 | ||
| Int. Cl. H01P 1/32 (2006.01) | ||
| U.S. Cl. 333—1.1 [333/24.2] | 10 Claims |
| 1. A nonreciprocal circuit device comprising:
permanent magnets;
a ferrite to which a direct current magnetic field is applied by the permanent magnets;
a plurality of central electrodes disposed on the ferrite, the central electrodes being electrically insulated from each other
and intersecting each other; and
a circuit substrate having a terminal electrode disposed on a surface thereof; wherein
the permanent magnets and the ferrite which are disposed on the circuit substrate are covered with a resin layer; and
the resin layer includes at least an innermost layer made of a non-magnetic resin material and a magnetic resin layer having
a magnetic filler mixed therein.
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